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參數(shù)資料
| 型號(hào)： | MIC2196BM |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 400kHz SO-8 Boost Control IC |
| 中文描述： | SWITCHING CONTROLLER, 440 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁(yè)數(shù)： | 10/11頁(yè) |
| 文件大小： | 68K |
| 代理商： | MIC2196BM |
MIC2196
Micrel
MIC2196
10
August 2004
A minimum 1
μ
F ceramic capacitor is required to decouple the
V
IN
. The capacitor should be placed near the IC and con-
nected directly between pins 8 (VCC) and 6 (GND). For V
IN
greater than 8V, use a 4.7
μ
F or a 10
μ
F ceramic capacitor to
decouple the VDD pin.
Efficiency Calculation and Considerations
Efficiency is the ratio of output power to input power. The
difference is dissipated as heat in the boost converter. The
significant contributors at light output loads are:
The VIN pin supply current which includes the
current required to switch the external
MOSFETs.
Core losses in the inductor.
To maximize efficiency at light loads:
Use a low gate charge MOSFET or use the
smallest MOSFET, which is still adequate for the
maximum output current.
Use a ferrite material for the inductor core, which
has less core loss than an MPP or iron power
core.
The significant contributors to power loss at higher output
loads are (in approximate order of magnitude):
Resistive on-time losses in the MOSFET
Switching transition losses in the MOSFET
Inductor resistive losses
Current sense resistor losses
Output capacitor resistive losses (due to the
capacitor
’
s ESR)
To minimize power loss under heavy loads:
Use logic level, low on resistance MOSFETs.
Multiplying the gate charge by the on-resistance
gives a figure of merit, providing a good balance
between switching and resistive power dissipa-
tion.
Slow transition times and oscillations on the
voltage and current waveforms dissipate more
power during the turn-on and turn-off of the low
side MOSFET. A clean layout will minimize
parasitic inductance and capacitance in the gate
drive and high current paths. This will allow the
fastest transition times and waveforms without
oscillations. Low gate charge MOSFETs will
switch faster than those with higher gate charge
specifications.
For the same size inductor, a lower value will
have fewer turns and therefore, lower winding
resistance. However, using too small of a value
will increase the inductor current and therefore
require more output capacitors to filter the output
ripple.
Lowering the current sense resistor value will
decrease the power dissipated in the resistor.
However, it will also increase the overcurrent
limit and may require larger MOSFETs and
inductor components to handle the higher
currents.
Use low ESR output capacitors to minimize the
power dissipated in the capacitor
’
s ESR.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2196BM TR | 功能描述:IC REG CTRLR BST FLYBK PWM 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤(pán) 包裝:帶卷 (TR) |
| MIC2196YM | 功能描述:DC/DC 開(kāi)關(guān)控制器 SO-8 3V Boost Controller (Lead Free) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MIC2196YM LED EV | 功能描述:電源管理IC開(kāi)發(fā)工具 SO-8 3V Boost Contoller (Lead Free) - Evaluation Board RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MIC2196YM TR | 功能描述:DC/DC 開(kāi)關(guān)控制器 SO-8 3V Boost Contoller (Lead Free) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MIC2196YM | 制造商:Micrel Inc 功能描述:PWM CONTROLLER BOOST 400MHZ 8SOIC |
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